MPC89E53AF datasheet(27/38 Pages) MEGAWIN

27 / 38 page

POWER-DOWN mode

The user can set the bit PCON.1 to drive this chip entering POWER-DOWN mode.

In the POWER-DOWN mode, the on-chip oscillator is stopped. The contents of on-chip RAM

and SFRs are maintained.

The power-down mode can be woken-up by either hardware reset or /INT0, /INT1, /INT2 and

/INT3 external interrupts. When it is woken-up by RESET pin, the program will execute from

the address 0x0000, and be carefully to keep RESET pin active for at least 10ms in order to

get a stable clock while waking up this chip from POWER-DOWN mode. If it is woken-up from

I/O, the program will jump to related interrupt service routine. To use I/O wake-up,

interrupt-related registers have to be programmed accurately before power-down is entered.

Pay attention to add at least one “NOP” instruction subsequent to the power-down

instruction if I/O waken-up is used.

Mode

Program Memory

ALE

PSEN

Port0

Port1

Port2

Port3

Idle

Internal

Data

Idle

External

Float

Data

Address

Data

Power-Down

Internal

Data

Power-Down

External

Float

Data

Pin Status in IDLE Mode and POWER-DOWN Mode

3. POWER-ON FLAG (POF)

The register bit in PCON.4 is set only by power-on action. System RESET from

watch-dog-timer, software RESET and RESET pin can not set this bit. It can be cleared by

firmware.

In System Programming (ISP)

To develop a good program for ISP function, the user has to understand the architecture of the

embedded flash.

The embedded flash consists of 30 pages. Each page contains 512 bytes.

Dealing with flash, the user must erase it in page unit before writing (programming) data into it.

Erasing flash means setting the content of that flash as FFh. Two erase modes are available in

this chip. One is mass mode and the other is page mode. The mass mode gets more

performance, but it erases the entire flash.

The page mode is something performance less,

but it is flexible since it erases flash in page unit.

Unlike RAM’s real-time operation, to erase flash or to write (program) flash often takes longer

time to finish.

MEGAWIN

MPC89x53A Data Sheet

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